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Description: This is a very simple board that takes a 6-12V input voltage and outputs a selectable 5V or 3.3V regulated voltage. All headers are 0.1" pitch for simple insertion into a breadboard.

Input power can be supplied to either the DC barrel jack or the two pin header labeled + and -. Output power is supplied to the pins labeled GND and VCC. Board has both an On/Off switch and a voltage select switch (3.3V/5V).

The two sets of four GND and VCC holes are spaced such that when connected to our Basic Breadboard both power busses will be powered.

Note: Headers are not supplied. You will need to supply your own headers to connect this board to a breadboard. Check below for some breakaway header strips.

Dimensions: 2.15x0.65"


  • 6-12V input voltage via barrel jack or 2-pin header
  • 3.3V or 5V regulated output voltage
  • 800mA Operating Current
  • ON/OFF switch
  • Output voltage select switch
  • Power status LED
  • PTC fuse protected power
  • 5.5x2.1mm center positive barrel jack


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Customer Comments

  • NewEgg has something similar for $3.20.

  • This is cool but I’d really like to see it with simultaneous dual voltage output. I often have breadboard projects where I have a 3.3v and a 5v rail at the same time.

  • 2 SMD switches - $2.00 or less 1 1206 SMD LED - $0.10 1 Voltage regulator - $2.00 or less PCB - $2.00 or less Others - $2.00 or less Total $5.10 … buy it with sparkfun’s logo $226 (Y)

  • Much the same as the breadboard power supply kit ( ), yes?

  • Awesome idea!

  • Current Rating? LM317 = 3A, 1N4001 = 1A, PTC = 0.5A? So, half an Amp?

Customer Reviews

4.3 out of 5

Based on 3 ratings:

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2 of 2 found this helpful:


This wonderful little board let’s me choose 3.3V for a Particle board or 5V for an arduino and the extra header let’s me pull off the source 12V.

1 of 1 found this helpful:

Great little supply for breadboarding

Having a few of these lying around makes it easy to quickly try something or leave something with a supply handy.

Very Handy

I have only recently begun working on electronics projects. This power supply works well for my needs. I mostly need 5 volts, for my breadboard for small projects.

I soldered four header pins into the board and that was that. I pushed into the breadboard easily. There is an on-off switch and a switch to go from 3 volts to 5 volts.

Works great. Very happy with it for the price.